Update version parameter format in SpdyAltSvcWireFormat.

net/spdy/spdy_alt_svc_wire_format.h

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains data structures and utility functions used for serializing
 // and parsing alternative service header values, common to HTTP/1.1 header
 // fields and HTTP/2 and QUIC ALTSVC frames.  See specification at
 // https://httpwg.github.io/http-extensions/alt-svc.html.
 
 #ifndef NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
 #define NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 
 using base::StringPiece;
 
 namespace net {
 
 namespace test {
 class SpdyAltSvcWireFormatPeer;
 }  // namespace test
 
 class NET_EXPORT_PRIVATE SpdyAltSvcWireFormat {
  public:
+  using VersionVector = std::vector<uint16>;
+
   struct NET_EXPORT_PRIVATE AlternativeService {
     std::string protocol_id;
     std::string host;
+
     // Default is 0: invalid port.
     uint16 port = 0;
-    // Default is 0: unspecified version.
-    uint16 version = 0;
     // Default is one day.
     uint32 max_age = 86400;
     // Default is always use.
     double probability = 1.0;
+    // Default is empty: unspecified version.
+    VersionVector version;
 
     AlternativeService();
     AlternativeService(const std::string& protocol_id,
                        const std::string& host,
                        uint16 port,
-                       uint16 version,
                        uint32 max_age,
-                       double probability);
+                       double probability,
+                       VersionVector version);
+    ~AlternativeService();
 
     bool operator==(const AlternativeService& other) const {
       return protocol_id == other.protocol_id && host == other.host &&
              port == other.port && version == other.version &&
              max_age == other.max_age && probability == other.probability;
     }
   };
   // An empty vector means alternative services should be cleared for given
   // origin.  Note that the wire format for this is the string "clear", not an
   // empty value (which is invalid).
@@ skipping 22 matching lines @@
                                      StringPiece::const_iterator end,
                                      uint32* value);
   static bool ParseProbability(StringPiece::const_iterator c,
                                StringPiece::const_iterator end,
                                double* probability);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_